The view parameters contains
information about the parameters (arguments) of all functions in
the current database. Only those functions are shown that the
current user has access to (by way of being the owner or having
some privilege).

Table 34-29. parameters
Columns

Name

Data Type

Description

specific_catalog

sql_identifier

Name of the database containing the function (always
the current database)

specific_schema

sql_identifier

Name of the schema containing the function

specific_name

sql_identifier

The "specific name" of the
function. See Section
34.38 for more information.

ordinal_position

cardinal_number

Ordinal position of the parameter in the argument
list of the function (count starts at 1)

parameter_mode

character_data

IN for input parameter,
OUT for output parameter, and
INOUT for input/output
parameter.

is_result

yes_or_no

Applies to a feature not available in PostgreSQL

as_locator

yes_or_no

Applies to a feature not available in PostgreSQL

parameter_name

sql_identifier

Name of the parameter, or null if the parameter has
no name

data_type

character_data

Data type of the parameter, if it is a built-in type,
or ARRAY if it is some array (in
that case, see the view element_types), else USER-DEFINED (in that case, the type is
identified in udt_name and
associated columns).

character_maximum_length

cardinal_number

Always null, since this information is not applied to
parameter data types in PostgreSQL

character_octet_length

cardinal_number

Always null, since this information is not applied to
parameter data types in PostgreSQL

character_set_catalog

sql_identifier

Applies to a feature not available in PostgreSQL

character_set_schema

sql_identifier

Applies to a feature not available in PostgreSQL

character_set_name

sql_identifier

Applies to a feature not available in PostgreSQL

collation_catalog

sql_identifier

Always null, since this information is not applied to
parameter data types in PostgreSQL

collation_schema

sql_identifier

Always null, since this information is not applied to
parameter data types in PostgreSQL

collation_name

sql_identifier

Always null, since this information is not applied to
parameter data types in PostgreSQL

numeric_precision

cardinal_number

Always null, since this information is not applied to
parameter data types in PostgreSQL

numeric_precision_radix

cardinal_number

Always null, since this information is not applied to
parameter data types in PostgreSQL

numeric_scale

cardinal_number

Always null, since this information is not applied to
parameter data types in PostgreSQL

datetime_precision

cardinal_number

Always null, since this information is not applied to
parameter data types in PostgreSQL

interval_type

character_data

Always null, since this information is not applied to
parameter data types in PostgreSQL

interval_precision

character_data

Always null, since this information is not applied to
parameter data types in PostgreSQL

udt_catalog

sql_identifier

Name of the database that the data type of the
parameter is defined in (always the current
database)

An identifier of the data type descriptor of the
parameter, unique among the data type descriptors
pertaining to the function. This is mainly useful for
joining with other instances of such identifiers. (The
specific format of the identifier is not defined and not
guaranteed to remain the same in future versions.)